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Hum, I'll put my $8 Craftsman Black Oxides (set of 21) I just got up against these and see if they are worth 500% more... If you need holes cut to this precision (most often over and over like say skinning an aircraft) you by the specific drill. Donâ€™t buy a set like this for DIY home use.

Good for drilling hard(er) metal where the heat generated would quickly dull lesser bits, but in the description are they coated with cobalt, or a cobalt alloy that is (also) coated? They appear to be only the former which reduces their uses to shorter term (much thinner metal) use period before cool down.

Last time I went to grainger all I wanted was 4 foot of temperature resistant fiberglass/silicone wire, the type you find in appliances wired to the heating element. They would only sell me a 100' spool of the stuff at about twice the cost per foot as what the local mom'n'pop sells it by the foot for. Crazy how they price the stuff, a manufacturer wouldn't buy only one spool at a time and nobody else would spend over $100 to get a length they need for one wiring job which is worth $3. Well, maybe an appliance repair man would...

You know, I was checkâ€™n Amazon for that set and I didn't get a hit. odd.
For $90 w/shipping those Irwin Brand are nice as they're saying actual Cobalt M-35 Metal.

While that N-T set of actual cobalt aren't bad; although I don't believe their same mfg, as it says "Includes metal case; A" Now, I don't believe they can say the case is made here, and fill with China bits... The green set doesn't say anything... so they're China.

As to Grainger or N-T they're now both selling ton of offshore sourced junk and yes overpriced. The only thing from Grainger I'll grab is "clearance" a (use the company acct# to get a discount) then just pick-up down the street from the will-call drop... paying cash.

^ I suspect you're right about different factory, I was basing it on the cases looking identical from first glance (except color of course) but then I saw them zoomed in and there are several slight differences.

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